Roleset impede.01 Verbnet Class: NONE "hinder, try to stop":

Roles:

Arg0:entity attempting to stop something


Arg1:Theme (action or object being prevented)


Arg2:secondary predication or action


Arg3:instrument

Examples:

person: ns tense: present aspect: ns voice: active form: full


usually just transitive (-)
``The purpose of the bill is to put the brakes on airline acquisitions that would so load a carrier up with debt that it would impede safety or a carrier's ability to compete,'' Rep. John Paul Hammerschmidt, R., Ark. said.
Arg0:	it
ArgM-MOD:	would
REL:	impede
Arg1:	safety or a carrier's ability to compete




with instrument? (-)
John impeded Mary from studying with his incessant pleas for sex.
Arg0:	John
REL:	impeded
Arg1:	Mary
Arg2-from:	studying
Arg3-with:	his incessant pleas for sex

I'm going to get in trouble for this example, I just know it. Only use "instrument" when it is clearly separate from the agent.